PROGRESSES AND FURTHER CONSIDERATIONS ON THE RESEARCH OF PEROVSKITE LEAD-FREE PIEZOELECTRIC CERAMICS

Abstract

The research on lead-free piezoelectric ceramics has been one of the important fields worldwide for years for the sustainable development of the world. In recent years, the author and his group concentrated their work on perovskite lead-free piezoelectric ceramics, especially on ( Bi 1/2 Na 1/2) TiO 3 ( BNT )- and K 1/2 Na 1/2 NbO 3 ( KNN )-based ceramics. In this paper, the researches of the composition design on BNT- and KNN-based lead-free piezoelectric ceramics, the effects of doping on the properties of these ceramics, the study of the temperature stability of these ceramics, and the fabrication technique used in the author's group for these ceramics are reviewed, and the further considerations and some prospects to be resolved in coming years from the viewpoint of the device applications of these ceramics are suggested.